I was also a Tapatalk user (when mobile) before the change. I agree with most here that it was quicker to navigate. I may not have had the best workflow, because I don't find the difference to be staggering compared to the browser.I've made the move to reading and responding on browser. Still prefer Tapatalk. I really miss the notifications of threads and mentions, etc.
One benefit to using the new interface is that you can see alerts related to feedback, trouble reports, etc. You can also give feedback to posts, which Tapatalk never supported (rep in the old system). So there are some benefits to the new system.
From reading this thread, I get the feeling that the people who are the most frustrated are those who use tablets. I may be reading into it. I never browsed with Tapatalk or my browser on my iPad, so I don't have that reference. I only used it on my phone.